<style type="text/css">
#seta21{
  position: absolute;
  top: 940px;
  left: 470px;
  top: px;
  left: px;
  width: px;
  height: px;
  border-top: 0px  ;
  border-right: 0px  ;
  border-bottom: 0px  ;
  border-left: 0px  ;
}

</style>
